小编Kup*_*iOS的帖子

我有这个DDUnitConverter用于货币转换的代码.

#import "DDUnitConverter.h"
#import "DDCurrencyUnitConverter.h"

- (void) convertCurrency {

  DDUnitConverter *converter = [DDUnitConverter currencyUnitConverter];

  NSNumber *from = [NSNumber numberWithInt:42];

  NSNumber *to = [converter convertNumber:from fromUnit:DDCurrencyUnitUKPoundSterling toUnit:DDCurrencyUnitUSDollar];

  NSLog(@"new value: %@", to);
}

我想根据用户的选择设置fromUnit:和toUnit:参数.我该怎么办？